Heavy cyclopropene analogues R4SiGe2 and R4Ge3 (R = SiMe Bu2) – New members of the cyclic digermenes family
摘要:
1H-Siladigermirene R4SiGe2 (2a) and 1H-trigermirene R4Ge3 (2b) (R = SiMe'Bu,) with a Ge=Ge double bond were synthesized by the reaction of tetrachlorodigermane RGeCl2-GeCl2R with dilithiosilane R2SiLi2 and dilithiogermane R2GeLi2, respectively. The skeletal Ge=Ge double bond of 2a is trans-bent (51.0(2)degrees) with a bond distance of 2.2429(6) angstrom. The reaction of both 2a and 2b with CH2Cl2 resulted in the formation of unusual four-membered ring compounds 5a and 5b as a result of a ring expansion reaction. 1H-Trisilirene 7a and 3H-disilagermirene 7b with an Si=Si double bond also smoothly reacted with CH2Cl2 to yield the four-membered ring systems 8a and 8b, respectively. (c) 2006 Elsevier B.V. All rights reserved.
Imino(silyl)disilenes: application in versatile bond activation, reversible oxidation and thermal isomerization
作者:Richard Holzner、Amelie Porzelt、Uhut S. Karaca、Fiona Kiefer、Philipp Frisch、Daniel Wendel、Max C. Holthausen、Shigeyoshi Inoue
DOI:10.1039/d1dt01629f
日期:——
enhanced stability, disilene 2 retains high reactivity in the activation of small molecules, including H2. The rare example of a disilene radical cation 7 is isolated and shows reversible redox behavior. White phosphorous (P4) selectively reacts with 2 to give the unique cage-compound 8. Selective thermal rearrangement of 2 at higher temperatures yields the A2SiSiB2-type disilene 9 (A = NItBu, B = SitBu2Me)
报道了带有N-杂环亚氨基 (A = NI t Bu) 和三烷基甲硅烷基 (B = Si t Bu 3 1,B = Si t Bu 2 Me 2 ) 基团的两种新型 ABSi SiAB型二硅烯。在减小的空间需求2所导致高度稳定的,尽管如此灵活的系统,因此(ë / Ž)异构化从室温直至观察到90℃。所提出的异构化机制通过与实验结果一致的单体亚甲硅烷进行。尽管稳定性增强,二硅烯2在小分子(包括 H 2 )的活化中保持高反应性。二硅烯自由基阳离子7的罕见例子是孤立的,并显示出可逆的氧化还原行为。白磷 (P 4 ) 选择性地与2反应生成独特的笼状化合物8。2在较高温度下的选择性热重排产生 A 2 Si SiB 2型二硅烯9(A = NI t Bu,B = Si t Bu 2 Me),其具有两性离子和配位中心 Si-Si 键的特性。拟议的机制通过 最初的 NHI 迁移,然后是甲硅烷基迁移。
Oxidation reactions of a versatile, two-coordinate, acyclic iminosiloxysilylene
作者:Dominik Reiter、Philipp Frisch、Daniel Wendel、Fabian M. Hörmann、Shigeyoshi Inoue
DOI:10.1039/d0dt01522a
日期:——
Due to their outstanding reactivity, acyclic silylenes have emerged as attractive organosilicon alternatives for transitionmetal complexes on the way to metal-free catalysis. However, exploration of their reactivity is still in its infancy, as only a few derivatives of this unique compound class have been isolated so far. Here, we present the results of an extensive reactivity investigation of the
Isolable Silyl and Germyl Radicals Lacking Conjugation with π-Bonds: Synthesis, Characterization, and Reactivity
作者:Akira Sekiguchi、Tomohide Fukawa、Masaaki Nakamoto、Vladimir Ya. Lee、Masaaki Ichinohe
DOI:10.1021/ja0126780
日期:2002.8.1
tris[di-tert-butyl(methyl)silyl]silyl and -germyl anions with dichlorogermylene-dioxane complex results in the formation of stable tris[di-tert-butyl(methyl)silyl]silyl and -germyl radicals 1 and 2, representing the firstisolableradical species of heavier Group 14 elements lacking stabilization by conjugation with pi-bonds. The crystal structures of both silyl and germyl radicals 1 and 2 showed a completely
Broadening the Scope of Ancillary Phosphane‐Type Ligands: A Systematic Comparison of PR
<sub>3</sub>
, PR
<sub>2</sub>
BH
<sub>3</sub>
<sup>–</sup>
, and SiR
<sub>3</sub>
<sup>–</sup>
and Their Chalcogen Derivatives
作者:Theresa I. Kückmann、Franz Dornhaus、Michael Bolte、Hans‐Wolfram Lerner、Max C. Holthausen、Matthias Wagner
DOI:10.1002/ejic.200601207
日期:2007.5
This work describes a systematic experimental and theoreticalstudy of the properties of two series of isoelectronic and largely isosteric ligands, namely PPh 2 Me, PPh 2 BH 3 - , and SiPh 2 Me - and SPtBu 3 , SPtBU 2 BH 3 - , and SSitBu 3 - . In addition, we have also investigated the oxoderivatives OPPh 2 BH 3 - and OSiPh 2 Me-. Based on X-ray crystal structure determinations (Fe-CO and C-O bond